You can do a quick query like:
$year = date( 'Y' );
$query = new WP_Query( 'year=' . $year );
Or a date query if you want to do it the regular way:
$args = array(
'date_query' => array(
array(
'year' => date( 'Y' )
),
),
);
$query = new WP_Query( $args );
More info here: https://codex.wordpress.org/Class_Reference/WP_Query#Date_Parameters